Narges Takhtkeshha, Fondazione Bruno Kessler (FBK) and TU Wien, Italy; Onur Can Bayrak, Fondazione Bruno Kessler (FBK) and Yildiz Technical University, Turkey; Gottfried Mandlburger, TU Wien, Austria; Fabio Remondino, Fondazione Bruno Kessler (FBK), Italy; Antero Kukko, Juha Hyyppä, Finnish Geospatial Research Institute, National Land Survey of Finland, Finland